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Nearby pulsar a likely source of high-energy antimatter cosmic rays

1 month ago   |   By Astronomy Now

Geminga is the name given to a pulsar 800 light years away that spins on its axis every 4.2 seconds. It is one of the brightest sources of pulsar-generated gamma rays, sporting a faint but vast halo that, if visible to human eyes, would appear 40 times larger than the full moon.
New research based on observations by NASA's Fermi Gamma-ray Space Telescope indicates Geminga also may account for about 20 percent of the high-energy antimatter positrons that slam into Earth's upper atmosphere as cosmic rays.
“Our analysis suggests that this same pulsar could be responsible for a decade-long...
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